| [PATCH v5 7/8] Display current tcp memory allocation in kmem cgroup [message #43645 is a reply to message #43642] |
Tue, 04 October 2011 12:17   |
Glauber Costa
Messages: 916
Registered: October 2011
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Senior Member |
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This patch introduces kmem.tcp_current_memory file, living in the
kmem_cgroup filesystem. It is a simple read-only file that displays the
amount of kernel memory currently consumed by the cgroup.
Signed-off-by: Glauber Costa <glommer@parallels.com>
CC: David S. Miller <davem@davemloft.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
---
Documentation/cgroups/memory.txt | 1 +
mm/memcontrol.c | 11 +++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index c1db134..00f1a88 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -79,6 +79,7 @@ Brief summary of control files.
memory.independent_kmem_limit # select whether or not kernel memory limits are
independent of user limits
memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory
+ memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation
1. History
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6fb14bb..f178a64 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -465,12 +465,23 @@ static u64 tcp_read_limit(struct cgroup *cgrp, struct cftype *cft)
return memcg->tcp.tcp_max_memory << PAGE_SHIFT;
}
+static u64 tcp_usage_in_bytes(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+ return atomic_long_read(&memcg->tcp.tcp_memory_allocated) << PAGE_SHIFT;
+}
+
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.limit_in_bytes",
.write_u64 = tcp_write_limit,
.read_u64 = tcp_read_limit,
},
+ {
+ .name = "kmem.tcp.usage_in_bytes",
+ .read_u64 = tcp_usage_in_bytes,
+ },
};
static void tcp_create_cgroup(struct mem_cgroup *cg, struct cgroup_subsys *ss)
--
1.7.6
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